diff --git a/drivers/gpu/drm/i915/display/g4x_dp.c b/drivers/gpu/drm/i915/display/g4x_dp.c
index 112d91d81fdc..c58a3f249a01 100644
--- a/drivers/gpu/drm/i915/display/g4x_dp.c
+++ b/drivers/gpu/drm/i915/display/g4x_dp.c
@@ -1259,6 +1259,9 @@ bool g4x_dp_init(struct drm_i915_private *dev_priv,
 	struct drm_encoder *encoder;
 	struct intel_connector *intel_connector;
 
+	if (!assert_port_valid(dev_priv, port))
+		return false;
+
 	devdata = intel_bios_encoder_data_lookup(dev_priv, port);
 
 	/* FIXME bail? */
diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.c b/drivers/gpu/drm/i915/display/g4x_hdmi.c
index 5c187e6e0472..59704939c111 100644
--- a/drivers/gpu/drm/i915/display/g4x_hdmi.c
+++ b/drivers/gpu/drm/i915/display/g4x_hdmi.c
@@ -667,6 +667,9 @@ void g4x_hdmi_init(struct drm_i915_private *dev_priv,
 	struct intel_encoder *intel_encoder;
 	struct intel_connector *intel_connector;
 
+	if (!assert_port_valid(dev_priv, port))
+		return;
+
 	devdata = intel_bios_encoder_data_lookup(dev_priv, port);
 
 	/* FIXME bail? */
diff --git a/drivers/gpu/drm/i915/display/intel_crt.c b/drivers/gpu/drm/i915/display/intel_crt.c
index 673c03646696..643acf90e6d6 100644
--- a/drivers/gpu/drm/i915/display/intel_crt.c
+++ b/drivers/gpu/drm/i915/display/intel_crt.c
@@ -1062,6 +1062,8 @@ void intel_crt_init(struct drm_i915_private *dev_priv)
 	}
 
 	if (HAS_DDI(dev_priv)) {
+		assert_port_valid(dev_priv, PORT_E);
+
 		crt->base.port = PORT_E;
 		crt->base.get_config = hsw_crt_get_config;
 		crt->base.get_hw_state = intel_ddi_get_hw_state;
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index d1a9a3cf94b5..31001b9a29b0 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4665,6 +4665,9 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	bool init_hdmi, init_dp;
 	enum phy phy = intel_port_to_phy(dev_priv, port);
 
+	if (!assert_port_valid(dev_priv, port))
+		return;
+
 	/*
 	 * On platforms with HTI (aka HDPORT), if it's enabled at boot it may
 	 * have taken over some of the PHYs and made them unavailable to the
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 4f158c428937..d3fc498c82c1 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -7371,6 +7371,12 @@ static bool intel_ddi_crt_present(struct drm_i915_private *dev_priv)
 	return true;
 }
 
+bool assert_port_valid(struct drm_i915_private *i915, enum port port)
+{
+	return !drm_WARN(&i915->drm, !(DISPLAY_RUNTIME_INFO(i915)->port_mask & BIT(port)),
+			 "Platform does not support port %c\n", port_name(port));
+}
+
 void intel_setup_outputs(struct drm_i915_private *dev_priv)
 {
 	struct intel_encoder *encoder;
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index c744c021af23..53ca0e4e2357 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -539,6 +539,8 @@ void assert_transcoder(struct drm_i915_private *dev_priv,
 #define assert_transcoder_enabled(d, t) assert_transcoder(d, t, true)
 #define assert_transcoder_disabled(d, t) assert_transcoder(d, t, false)
 
+bool assert_port_valid(struct drm_i915_private *i915, enum port port);
+
 /*
  * Use I915_STATE_WARN(x) (rather than WARN() and WARN_ON()) for hw state sanity
  * checks to check for unexpected conditions which may not necessarily be a user
diff --git a/drivers/gpu/drm/i915/display/intel_dvo.c b/drivers/gpu/drm/i915/display/intel_dvo.c
index 9884678743b6..b386894c3a6d 100644
--- a/drivers/gpu/drm/i915/display/intel_dvo.c
+++ b/drivers/gpu/drm/i915/display/intel_dvo.c
@@ -509,6 +509,8 @@ void intel_dvo_init(struct drm_i915_private *i915)
 		return;
 	}
 
+	assert_port_valid(i915, intel_dvo->dev.port);
+
 	encoder->type = INTEL_OUTPUT_DVO;
 	encoder->power_domain = POWER_DOMAIN_PORT_OTHER;
 	encoder->port = intel_dvo->dev.port;
diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index 34ee9dd82a78..6ed613558cf8 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -3330,6 +3330,9 @@ bool intel_sdvo_init(struct drm_i915_private *dev_priv,
 	struct intel_sdvo *intel_sdvo;
 	int i;
 
+	if (!assert_port_valid(dev_priv, port))
+		return false;
+
 	assert_sdvo_port_valid(dev_priv, port);
 
 	intel_sdvo = kzalloc(sizeof(*intel_sdvo), GFP_KERNEL);
